Name: FukuyasuGame : XCOMReason : I don't know he cheated or he's really good at playing Xcom but he got the achievement for beating the game on Imposible difficulty + ironman + beating the game without buying a squad size at the same time and then 3 days later he got achievement Continental Fellow <=== Which mean you need to beat the game from 5 different starting location, that was so fast and i believe Xcom don't have a console comand like Xcom 2 so you can't use god mode.

Whilst beating XCOM on Impossible Ironman without any squad size is unlikely on your first go, it's not impossible - the order of the rest of his achievements also makes sense to me (notably, that he had the one for taking Zhang to the final mission pop up a few minutes before his difficulty-related ones, which is correct for normal gameplay - Rising Dragon pops up as the ending cutscene starts, other ones for finishing the game pop up as the cutscene ends). Beating the game from different start locations after that with low playtime could be explained via offline play, rushing through the missions on lowest difficulty, or by using mods - there are a handful for XCOM, including ones that give your soldiers massively increased HP, accuracy, movement, and damage.

As Reyals points out though, his Civ V ones are suspect, with lots of odd timestamps that suggest to me he was either using SAM or someone else's save files. His Endless Space achievement times are also very suspect, somehow travelling 10,000 parsecs and then 100,000 parsecs in 1 minute, destroying 50, then 200, then 500 fighters or bombers within 1 second. There's too many discrepancies and unusual unlocks there to be explained by offline play.